78747740 has 24 divisors (see below), whose sum is σ = 175098672. Its totient is φ = 29646080.

The previous prime is 78747703. The next prime is 78747743. The reversal of 78747740 is 4774787.

It is a junction number, because it is equal to n+sod(n) for n = 78747691 and 78747700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78747743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115466 + ... + 116145.

It is an arithmetic number, because the mean of its divisors is an integer number (7295778).

Almost surely, 2^78747740 is an apocalyptic number.

It is an amenable number.

78747740 is an abundant number, since it is smaller than the sum of its proper divisors (96350932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78747740 is a wasteful number, since it uses less digits than its factorization.

78747740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231637 (or 231635 counting only the distinct ones).

The product of its (nonzero) digits is 307328, while the sum is 44.

The square root of 78747740 is about 8873.9923371614. The cubic root of 78747740 is about 428.6268437339.

The spelling of 78747740 in words is "seventy-eight million, seven hundred forty-seven thousand, seven hundred forty".